Manual Air Conditioning System

AIR CONDITIONING SYSTEM (for Manual Air Conditioning System):

TERMINALS OF ECU

1. AIR CONDITIONING PANEL SUB-ASSEMBLY
(a) Disconnect the connectors from the air conditioning panel sub-assembly and inspect the connectors on the wire harness side, as shown in the chart below.









If the circuit is as specified, replace the air conditioning panel sub-assembly with a new one. If the circuit is not as specified, inspect the circuits connected to other parts.
(b) Connect the connectors to the air conditioning panel sub-assembly and inspect the back side from the wire harness side, as shown in the chart below.

















If the circuit is as specified, replace the air conditioning panel sub-assembly with a new one. If the circuit is not as specified, inspect the circuits connected to other parts.
2. AIR CONDITIONING AMPLIFIER
(a) Connect the connectors to the air conditioning amplifier and inspect the back side from the wire harness side, as shown in the chart below.

















(1) Waveform 1:





HINT: As vehicle speed increases, the cycle of the signal waveform narrows.

If the circuit is as specified, replace the air conditioning amplifier with a new one. If the circuit is not as specified, inspect the circuits connected to other parts.